Digitalis: also known as digitalis, poison ivy, purple-flowered digitalis, bellflower, biennial or perennial herbs, all densely covered with short hairs. Rooted leaves are ovate to ovate-lanceolate, with obtuse teeth on the margins and long stalks. In the spring of the second to third year in the center of the leaf cluster draws out the flower stem, as high as 1 ~ 1.5 m, stem leaves long ovate, edge with fine teeth, short-stalked or nearly sessile. Racemes terminal, corolla campanulate, pendulous, biased to one side, purplish red with dark purple spots on the inner surface. Capsule conical, seeds tiny. Flowering in May-June, fruiting in June-July. Native to the mountains of central and southern Europe. Now in China, Zhejiang, Shanghai, Jiangsu and Shandong and other places have been cultivated in large quantities.